6-4 | Thermox TM2000 Oxygen Analyzer
Error Messages
Error messages on the control unit display indicate problems with the
operation of the analyzer. Use this section to see the type of problem your
error message indicates and then go to the “Diagnostic Checks” section at
the end of this chapter for help on how to perform diagnostic checks to
pinpoint the problem.
Always perform the easiest checks first. Only perform the more dif-
ficult checks if the easiest checks don’t locate the problem.
Cell Is Over Temp
This error message indicates that the sensor temperature is 30° C or more
over its correct operating temperature. The software shuts off the furnace
until the temperature returns to normal operating range.
If this message soon goes away, it indicates that the temperature has
returned to an acceptable range. If there is a problem with the sensor
temperature control system, you will see another error message after this
message appears.
Excessive Cal Error
If a primary calibration cannot correct the sensor temperature within
the software’s allowable limits, this message is displayed to indicate the
Primary Calibration has failed. This message could indicate one of the fol-
lowing problems:
Calibration gas setup problem
Incorrect flow rates between calibration gases
Process pressure incorrectly entered
Failed cell (primary calibration should be run at this time)
Leak or plug in plumbing
Cell lead wires polarity reversed
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